01 - Arrange chicken breasts in the bottom of the slow cooker. Top with chopped onions, garlic, and broccoli florets distributed evenly.
02 - Whisk together chicken broth, cream cheese, sour cream, milk, Dijon mustard, paprika, salt, and pepper in a medium bowl until completely smooth and combined.
03 - Pour sauce mixture evenly over chicken and vegetables. Cover and cook on high setting for 4 hours or low setting for 6–7 hours until chicken registers 165°F internally.
04 - Thirty minutes before serving, shred or slice chicken directly in the slow cooker. Stir in shredded cheddar cheese until melted and incorporated throughout.
05 - For thicker consistency, mix cornstarch with 2 tablespoons water to form slurry. Stir into slow cooker and cook additional 15–20 minutes until sauce reaches desired thickness.
06 - Taste and adjust salt and pepper as needed. Serve immediately, garnished with additional cheddar or fresh herbs if desired.